I was flying through MCI the other week, and everyone there was up against the already too small luggage carousel. So thought long and hard about this one. There was one lady who had to turn over every last piece of luggage that went by. Somehow she thought she was helping - it only got everything screwed up on the carousel!
But I realized that the problem is, most people have absolutely no idea what their luggage looks like. I have seen people turn over a hundred green bags to try and find theirs - only to end up taking a blue one! They HAVE to stand next to the conveyor just to figure out what bag is theirs.
One thing I think would work - have the section just after the luggage dumps onto the conveyor be for frequent flyers. They can stand a few steps away from the carousel, and identify and quickly take their bags. That leaves fewer bags for the rest of the folk to have to sort through.